|Rank|Heat|Name|Nationality|Time|Notes|
|---|---|---|---|---|---|
|1|1|Lacena Golding-Clarke|Jamaica|12.74|Q, PB|
|2|1|Vonette Dixon|Jamaica|12.83|Q, PB|
|3|2|Diane Allahgreen|England|12.92|Q, PB|
|4|2|Brigitte Foster|Jamaica|12.98|Q|
|5|2|Angela Atede|Nigeria|13.01|Q, SB|
|6|1|Angela Whyte|Canada|13.03|Q, PB|
|7|1|Julie Pratt|England|13.08|q, PB|
|8|2|Jacquie Munro|Australia|13.22|q|
|9|1|Melanie Wilkins|England|13.29||
|9|2|Sriyani Kulawansa|Sri Lanka|13.29||
|11|1|Fiona Cullen|Australia|13.45||
|12|2|Rachel King|Wales|13.58||
|13|2|Tamsin Stephens|Northern Ireland|13.59||
|14|1|Christy Akinremi|Nigeria|13.73||
||2|Shabana Khattak|Pakistan|DNF||
||1|Carole Kaboud Mebam|Cameroon|DNS||
||1|Olutoyin Augustus|Nigeria|DNS||

Question: how many women clocked less than 13 secs the women's heat of 100m hurdles?
Answer: 4